Shitty parents do that. How could you be certain housekeeping or anyone else wouldn’t go in the room while you were out? Or they were hurt or sick or someone fell out of bed and it’s a long way down from hotel beds for a kid. How could a parent assume they were just sleeping? Or most likely scenario for these situations-the kid gets up for one reason or another and can’t find mommy or daddy and panics and opens the door to the outside and goes looking for them.